These deck plates are easier to open and close than the screw-out or quarter-turn models but have a very substantial gasket. If you have ever tried to open one of the other types of deckplate only to have it defy your efforts by crossing threads or sticking, you will appreciate how easily these open and close. The only drawback I can see is that they do not have a positive lock so that in the event of a capsize, if a heavy object struck one of these deckplates from the back, it could pop out. That seems a long shot, though.
The new 'pop out' hatches are a treat, makes it easy to store stuff for quick access out on the river (drink mix, ice etc). Was concerned about losing hatches on the road so screwed an eye into the boss on back of and tied a lanyard to the ring.
cheers, Skip Johnson